Air vent valve



July 8,1952 7 :E; J. ZEiTLIN 2,602,590 LAIR VENT VALVE" Y I FiledMarchs, 1949 INVEN'I'OR. EDWARD u]. ZEJY'LJN ATTURNEY Patented July 8, 1952Apn et'i nlMar -h 3*. 1 4

2' Claims; (01. v

This invention relates to" valves and more-par ticularly to air-ventvalves for'steam heating sys tems; "The valve I more particularlybelongs toa class of valves which permit'expulsion of air fromthesystemunder action of internal pressuregeneratedby the expandedvapors. Furthermorathe valve is arranged to close automatically-when thehot vapors contact the thermostatic element; The airport valvecloses,automatically-toprevent re admis'sion of air when "the internalpressure" of the system is below atmospheric pressure andthusapartialvacuum-ismaintained.

One ot-the obiectsof this inventionfis to provide; anai rvent valve ofthe type that permits varyingjthe rate-of discharge-of air from varioussections in the heating system in accordance with the ventingrequirements or volume of air'tobe= eliminated to, balance the rate of"admission of steam to theradiators in the various sections of the-hea ss m- Another object of this inventionis to provide an :air vent valvethat permits the egress tof air iromthe heating ystem when the steampressure in-"th'e' system rises and prevents "the ingres s pf air backinto the heating system whenthe steam pressure'in'the'system drops.

A still furtherpbj ect of this invention is to provide an adjustable airvent inthe valve to vary the rate of egress of air from the-valve so asto balance the Venting of the various sections of a heating system;

A Still. .further object of this invention is to providdan air checkvalve that is normally ;open, and said valve being closed byatmospheric;pre s-.v sure w en the internal pressure within saidvalveisgless than atmospheric;

Qtherobjects' of this inventionniay be appar entiby reference to theaccompanying description I and the drawing in which Fig. 1 is a frontelevationalviewof the valve,

Fig. 2is an exploded view of-the valve shown that supports the valvestructure and is provided with threaded exterior and interior means forafilxing' said valve to the heating system. The valve I is also providedwith an exterior barrel shaped housing 12 and a top or cap member I4. Athermostatic element l (in this case connoted that apprcxirnately halfpfthis "elei'ne .vided in the valve' 19m align with s an-ipf ape n I9 m eqs v'hei 'lto seminar rain was str icted in the form of assailed beuowathatls;

common in-the art) "ismountedwith-in the-waive?- housingand -th'ebellows I5 is provided With? an extended'threaded member 4:6 that'isthreadabl v a cone shaped:valveseat 23 formed in thefintei ior of basemember i li A-port z i connects hevaive I seat'*23 with the-exterior ofthe -basel I posite .end. of the base -l-l 'is provided "w ththreadedopening 25 to per-mit threajdably' sep in'g the-housingI=2'-thereto. The h'cni'silji'g'- provided with an external 'thread lfi-at' i an'dis also provided witha cutout p'ortien 2;! {a its -upper'periphery: A stop 28' 1's threadably se cured in a -socket i n-= thehousing l2 andprjo ects 5 outwardly and' 'is 'adj 'acen't to thecutout'fportioh 21 Referring to theicap member l4;--it may b hollowedoutso-thatfthecap nimbei WflLfiEdo over the :exteriorqf the member 12and the an; member *1 M is previded withiian elongated"slbt 31iadjacentthe-lower edge of-the'cap I14;

Referringeto Figs. --8', "4' and-5i w may' -see construction of theairport and-butterfly F g. s imstrates-rt e biitterfiywalve 119; 7Fillustrates the diskj-i member l 8 and it noted that a-pairofaperture 2,9 and 20 and iii mounted through 1 159. a iens a tures,-";the pins :maybeffastenejd ina such as riveting, but in such f astenin th tures 31 and32 in the disk 8. Thusw'ith thejpi ti a s ra edi nF s; 't iz oneposition; =the=butterfly valve 1-5 fwill er position-illustrated solid'lines closing the air port area 33 and in an open position when air isbeing discharged from the valve, the butterfly valve l9v will assume thedotted position illustrated, this is due to a designed stable balanceand a flat face around the apertures 3| and 32.

It is readily apparent, referring to Fig. 2, that the valve may beassembled as follows:

The butterfly valve [9 and disk l8 are first Joined so that they may beretained as illustrated in Fig. 5. The disk [8 is then threadablysecured to the extended threaded member ii of the bellows IS. The memberI6 is then threadably e.-

3 cured in the socket ll of the cap l4. This complete assembly isinserted through the housing [2 until the cap member l4 fits snugly overthe end of the housing l2 and the cutout portion 21 is in alignment withthe slot 34 of the cap member. By rotating the cap 14 with relation tothe housing l2 until the aperture provided for pin 28 is in the positionillustrated in Fig. 1, the pin 28 may then be secured to the member 12and thus provides a stop member. When turned to the left as shown inFig. 1, the stop pin 28 will abut against one end of the elongated slot34 and in this position, the greatest air port opening is provided. Whenthe cap member I l is'turned in an. opposite direction, the stop pin 28will abut with the opposite end of the elongated slot 34 and a completeclosure of the air vent will be attained. It is apparent that any degreeof opening may be attained by these two positions. barrel shaped housing12 holding the complete valve structure as described, it may bethreadably secured in the threaded socket 25 of the base H and with thevalve so mounted, the bellows member 15 must be set so that the valveface 22 is not in contact with the valve seat 23 and thus allows freepassage of air past the valve and its seat; but when'heat is applied tothe bellows l it must seat firmly on the valve seat 23 to close andprevent the passage of air or vapors through the port 24. It may befurther noted that the valve is so constructed that the valve face 22 isthe contact face of the steam vapors and being apart of the bellows I5;the heat acts upon the bellows to retain the valve face seated andclosed. In this way the delicate convolutions of the bellows areprotected from the steam vapors.

.In the normal functioning of the valve as described, it is apparentthat with the valve l0 threadably secured to a riser in the heatingsystem or a radiator, When the heat in the form of hot vapors starts torise, the cold air will pass through the valve passing the valve seataround the bellows through the port 33 of disk 18 and out pastthebutterfiy valve [9 as illustrated in Fig.5 passing through the cutoutportion 21 and out through the elongated slot 35. At this time thepositioning of cap 14 controls the degree of opening and therefore thevelocity of the air flow. A full opening permits a maximum air flow. Afull closing prevents the expulsion of air from the valve. The degree ofopening may be regulated to control the rate of venting of air from thesystem. Of course the valve is primarily intended to permit a maximumrequired. venting to insure a full venting of a particular system.

The purpose of venting valves in a system is to provide a. quicker meansof eliminating air from a system than is ordinarily possible by radiatorair venting valves.

The purpose of this valve is to provide a vari With the directing theheat first to the part of the heating system where the heat demand isgreatest. Also where the demand for heat is uniform throughout thesystem this valve provides a means to eliminate the air from all partsof the system at the same time regardless of the position with relationto the source of heat or to the amount and size of piping. The variableorifice in this valve provides this means of obtaining a ventingbalance.

Various changes and modifications may be made to the valve as describedwithout departing from the spirit of this invention and this inventionshall be limited only by the appended claims.

What is claimed is:

1. In an air'vent valve for a heating system a barrel shaped casinghaving an adjustable vent cap member supported thereon, a base portionthreadably secured to said casing, a valve seat portion, a thermostaticvalve in said casing and extending into said base portion, a passagethrough said base portion, said valve seating over said passage toprovide an annular chamber therebetween and being operable to engagesaid seat member to close said passage to flow therethrough, said valvebeing threadably supported from said cap member, said vent cap providedwith an elongated slot and said casing provided with an elongated cutoutportion, said vent cap adjustably mounted on said casing so that theelongated slot is in alignment with the cutout portion of said casing.

EDW. J. ZEI'I'LIN..

REFERENCES CITED The following references are of recordin the file ofthis patent: v

UNITED STATES PATENTS Number. Name Date 773,688, Still Nov. 1, 1904'1,247,218 Burkart Nov. 20, 1917 1,842,657 Cliiford Jan. 26, 19321,910,237 Cadwell May 23, 1933 2,190,197 Simpson Feb. 13, 1940 2,555,264Zeitlin May 29, 1951 FOREIGN PATENTS Number Country Date 537,747 FranceMar. 8, 1922

